Asus SABERTOOTH Z77, SABERTOOTHZ77, Z77 CPU C1E [Auto], CPU C3 Report [Auto], CPU Ratio [Auto], Active Processor Cores [All], Execute Disable Bit [Enabled], Hardware Prefetcher [Enabled]

3 Chapter

Active Processor Cores [All]

Allows you to choose the number of CPU cores to activate in each processor package. Configuration options: [All] or by CPU specification

Limit CPUID Maximum [Disabled]

[Enabled]	Allows legacy operating systems to boot even without support for CPUs
	with extended CPUID functions.
[Disabled]	For Windows® XP OS, select this option to disable this function.
Execute Disable Bit [Enabled]
[Enabled]	Enables the No-Execution Page Protection Technology.
[Disabled]	Forces the XD feature flag to always return to zero (0).
Intel Virtualization Technology [Disabled]
[Enabled]	Allows a hardware platform to run multiple operating systems separately
	and simultaneously, enabling one system to virtually function as several
	systems.
[Disabled]	Disables this function.
Hardware Prefetcher [Enabled]
[Enabled]	Allows a hardware platform to run multiple operating systems separately
	and simultaneously, enabling one system to virtually function as several
	systems.
[Disabled]	Disables this function.
Adjacent Cache Line Prefetch [Enabled]
[Enabled]	Allows a hardware platform to perform adjacent cache line prefetching.
[Disabled]	Disables this function.

CPU Power Management Configuration

This item allows you to manage and configure the CPU’s power.

CPU Ratio [Auto]

Allows you to set the ratio between the CPU Core Clock and the BCLK Frequency. Use <+> and <-> keys to adjust the ratio. The valid value ranges vary according to your CPU model.

Enhanced Intel SpeedStep Technology [Enabled]

Allows you to enable or disable the Enhanced Intel® SpeedStep Technology (EIST).

[Disabled]	The CPU runs at its default speed.
[Enabled]	The operating system controls the CPU speed.

CPU C1E [Auto]
[Auto]	Sets the default configuration.
[Disabled]	Disables this function.
[Enabled]	Enables the C1E support function. This item should be enabled in order to
	enable the Enhanced Halt State.

CPU C3 Report [Auto]

Allows you to disable or enable the CPU C3 report to OS.

Configuration options: [Auto] [Disabled] [Enabled]

3-22 Chapter 3: BIOS setup